CN103475947A - Streaming media distribution system and method based on software defined network - Google Patents
Streaming media distribution system and method based on software defined network Download PDFInfo
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Abstract
The invention provides a streaming media distribution system and method based on a software defined network. The method includes the steps that a first application server of an access network extracts request parameters from a received request for streaming media data and sends the extracted request parameters to a first network controller; the first network controller retransmits the request parameters to a first service dispatching engine and instructs the access network and relevant network elements to reserve links and bandwidth resources for the request, wherein the first service dispatching engine is connected with the first network controller through the Openflow protocol; the first service dispatching engine inquires whether the requested streaming media are local; when the requested streaming media are local, the first service dispatching engine selects a streaming media server locally; the selected streaming media server provides the requested streaming media through the reserved links and the reserved bandwidth sources.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of flow media distribution system and method based on software defined network.
Background technology
In internet stream media application in early days, there is no special CDN(Content Delivery/Distribution Network, content distributing network), several station servers are set on network, the player accessing Internet just can be seen to video frequency program, network sends media content as a transparent data transmission channel, because IP network is the service network of a kind of " doing one's best ", therefore Internet resources and bandwidth can not be guaranteed, therefore remote service can't guaranteed qos (Quality of Service, service quality), and the hot spot-effect often occurred causes server and backbone network overload and paralysis.
In order to solve the problem of Video service quality, people have expected in the situation that do not change network configuration and technology, on engineering, more real method is exactly CDN stack/nerve of a covering, CDN is superimposed upon on the physical carrier net, the server zone that is distributed in zones of different, consisting of, is a kind of virtual network that application layer services is provided: the application bearer network.By CDN, media content is published to the network " edge " that approaches the user most, makes the user can obtain required content nearby, solve the crowded situation of Internet, improve user's experience, and save the backbone network resource.Its essence is by increasing a large amount of edge memories and exchange the network bandwidth and QoS for.
Although the advantage of CDN is a lot, shortcoming is quite a few.CDN, by content being published to the most close user's network " edge ", although reduced the large problem of network bandwidth consumption, has increased a large amount of storage servers and buffer device at network edge, so it is the mode of a kind of " wide with the storage tape swapping "; In addition, because stacking network just is superimposed upon on the physical carrier network of lower floor, therefore to the control ratio of lower floor's network a little less than, the network management of needs dependence bearer network, scheduling of resource, QoS guarantee etc., therefore operating efficiency is low, the realization of key technology, such as content route, load balancing etc., all need support and the coordination of bottom-layer network; Therefore, the IPTV business that operator carries out at present, be all to adopt private network to guarantee user's service quality, provides the carrier-class service that can control, can manage, can run; Internet video (even having adopted internet C DN) is owing to can't realizing the controlled of Internet resources and can managing, so its service quality can not get effective assurance, the frequent phenomenon that pause and " card " occur.On various application networks (such as CDN network, P2P network etc.) the existing physical carrier network that constantly is added to, caused the too huge and undue complicated of physical carrier net, the direct difficulty of bringing like this is the network operation difficulty, and management cost constantly increases.
And along with the going deep into of national width speed-raising plan, now and transmittability in the future provide solid transmission bandwidth basis for streaming media service.Video traffic drives the Internet bandwidth explosive growth, and super broadband is imperative.The bandwidth problem of streaming media does not exist, and key is how to control and use these bandwidth, and the appearance of software defined network (SDN, Software Defined Network) has just in time solved this problem.SDN is the most important innovation of network field nearly ten years, and it is thought the technology of Future Ten year most critical by industry.
The feature of SDN comprises that (one) control to forward separates and (supports the exchange/routing function of third party's chain of command equipment open agreement Long-distance Control common hardware by Openflow etc.; (2) control plane centralization: improve the routing management flexibility, accelerate service fulfillment speed, simplify O&M; (3) Forwarding plane generalization: multiple exchange, routing function are shared generic hardware device into one; (4) controller software is able to programme; Can meet the customization demand by the software programming mode.
As shown in Figure 1, the basic ideas of its work are: the switching equipment in network (comprising router one 4, switch 15, optical line terminal OLT, gateway general packet radio service technical support node GGSN, general packet radio service technological service support node SGSN etc.) is all safeguarded a general stream table, by the stream table, controls the switch processes behavior.Stream table in switching equipment, by the OpenFlow agreement (being represented by dotted lines in Fig. 1) of standard, is supported control and the access of control end 13.Control end 13 is mutual by interface and upper level applications 11, make the function of whole network be conceptualized as the api interface 12 of standard, can be directly by programming, carry out configuration, optimization, management of Internet resources etc., according to particular demands, freely define the route approach of data and forward exchange regulation, final classification and the fine-grained management realized data flow.By public API, support application deployment etc. fast.Openflow V1.2 has increased IPv6 and has supported and the expansion of some actions, starts to support many controller to realize HA; Openflow V1.3 has increased the relevant support of QoS, sets up a plurality of connections between operation controller and Openflow switch and improves performance.
But, how to use the SDN technology to realize the distribution of Streaming Media, industry there is no concrete scheme at present.
Summary of the invention
The technical problem to be solved in the present invention is how to utilize the SDN network to carry out streaming media distribution.
In order to address the above problem, the invention provides a kind of streaming media distribution method based on software defined network, comprising:
The first application server of Access Network extracts required parameter from the received request to stream medium data, extracted required parameter is sent to the first network controller of Access Network;
Described first network controller is transmitted to the first service scheduling engine connected by the Openflow agreement by the described request parameter, and indication Access Network and related network elements are the reserved link of described request and bandwidth resources;
Whether the stream medium data that described first service scheduling engine inquiry is asked is in this locality; When in this locality, described first service scheduling engine is selected a streaming media server from this locality;
Selecteed streaming media server passes through reserved link and bandwidth resources provide asked stream medium data.
Alternatively, described method also comprises:
When asked stream medium data, during not in this locality, described first service scheduling engine is notified described first network controller;
Described first network controller is transmitted to the described request parameter the second application server of transmission network by described the first application server;
Described the second application server is determined Service Quality Metrics according to the described request parameter, and sends to the second network controller of transmission network;
Described second network controller is determined optimal transmission paths according to described Service Quality Metrics, and sends to the switching equipment of transmission network; From described first network controller receives the source address of described request, send to the second service scheduling engine connected by the Openflow agreement;
Described second service scheduling engine is selected a streaming media server from managed zone;
Selected streaming media server is by described switching equipment, according to described optimal transmission paths, to the source address of described request, provides asked stream medium data.
Alternatively, described first service scheduling engine also comprises from the step of a streaming media server of this locality selection:
Described first service scheduling engine notifies stream medium data that described first network controller asks in this locality;
Described first network controller starts asked streaming media service charging by described the first application server notice OSS, and notifies described first service scheduling engine that service is provided;
When asked stream medium data during not in this locality, described first service scheduling engine can also comprise after notifying the step of described first network controller:
Described first network controller starts, to asked streaming media service charging, the source address of described request to be sent to described second network controller by described the first application server notice OSS;
After described first network controller is received the request of the end service that streaming media server directly sends or sends by the second network controller, by described the first application server notice OSS, stop charging.
Whether the stream medium data that alternatively, described first service scheduling engine inquiry is asked also comprises before local step:
Described first service scheduling engine is selected the streaming media server of first burst that comprises asked stream medium data from this locality;
Selected streaming media server passes through the first burst that reserved link and bandwidth resources provide asked stream medium data; If do not receive the request that stops service after the first burst finishes, this streaming media server notifies described first network controller to continue to play by described first service scheduling engine.
Alternatively, described the first application server also comprises before the received step to extraction required parameter the request of stream medium data:
Described first network controller receives the request to stream medium data, is transmitted to described the first application server;
The first application server, according to the user ID inquiry OSS in this request, is confirmed that whether this user is legal and authority is arranged;
If the user is illegal or lack of competence, notifies described first network controller, and this user's user ID is sent to described first network controller; Described first network controller stops providing service to the corresponding user of described user ID;
If the user is legal and authority is arranged, carry out described the first application server from the received step to extraction required parameter the request of stream medium data.
The present invention also provides a kind of flow media distribution system based on software defined network, comprising:
The first network controller of Access Network, first service scheduling engine, streaming media server;
The first application server of Access Network, be connected with the first network controller by api interface, for the request to stream medium data received, extracts required parameter, and extracted required parameter is sent to described first network controller;
Described first network controller is for being transmitted to the first service scheduling engine connected by the Openflow agreement by the described request parameter, and indication Access Network and related network elements are the reserved link of described request and bandwidth resources;
Whether the stream medium data that described first service scheduling engine is asked for inquiry is in this locality; Select a streaming media server from this locality when in this locality;
Described streaming media server is for after being chosen by described first service scheduling engine, and passing through reserved link and bandwidth resources provides asked stream medium data.
Alternatively, described system also comprises:
The second application server of transmission network, second network controller, router, switching equipment;
The second service scheduling engine;
Described first service scheduling engine also, for working as asked stream medium data not when this locality, is notified described first network controller;
Described first network controller is also for when receiving that asked stream medium data, not after local notice, is transmitted to described the second application server by the described request parameter by described the first application server;
Described the second application server is connected with the second network controller by api interface, for according to the described request parameter, determining Service Quality Metrics, and sends to described second network controller;
Described second network controller is used for determining optimal transmission paths according to described Service Quality Metrics, and sends to described switching equipment; From described first network controller receives the source address of described request, send to the second service scheduling engine connected by the Openflow agreement;
Described second service scheduling engine is selected a streaming media server for the zone from managed;
Described streaming media server is for pass through described switching equipment when being chosen by described second service scheduling engine after, according to described optimal transmission paths, to the source address of described request, provides asked stream medium data.
Alternatively, described first service scheduling engine is also for selecting a streaming media server from this locality, notifies stream medium data that described first network controller asks in this locality;
Described first network controller is also for receiving that asked stream medium data is after local notice, start asked streaming media service charging by described the first application server notice OSS, and notify described first service scheduling engine that service is provided; When receiving that asked stream medium data is not after local notice, by described the first application server notice OSS, start, to asked streaming media service charging, the source address of described request to be sent to described second network controller; After the request of receiving the end service that streaming media server directly sends or sends by the second network controller, by described the first application server notice OSS, stop charging.
Alternatively, described first service scheduling engine also at the inquiry stream medium data of asking whether before this locality, select the streaming media server of first burst that comprises asked stream medium data from this locality;
Described streaming media server also provides the first burst of asked stream medium data for passing through reserved link and bandwidth resources after selected; If do not receive the request that stops service after the first burst finishes, by described first service scheduling engine, notify described first network controller to continue to play.
Alternatively, described first network controller also, for receiving the request to stream medium data, is transmitted to described the first application server; And when receiving the user illegally or, after the notice and user ID of lack of competence, stopping providing service to the corresponding user of described user ID;
Described the first application server also extracts required parameter for the request to stream medium data from received, according to the user ID inquiry OSS in this request, confirm that whether this user is legal and authority is arranged; If the user is illegal or lack of competence, notifies described first network controller, and this user's user ID is sent to the first network controller; If the user is legal and authority is arranged, carry out from the received operation to extraction required parameter the request of stream medium data.
At least one embodiment of the present invention provides a kind of novel streaming media distribution service plan, can pass through the OpenFlow agreement of standard based on switching equipment in the SDN network, support control and the access of control end, and can be by api interface and mutual these characteristics of application layer, redesigned a set of framework and flow process that is different from existing streaming media distribution service fully, by in access aspect and transmission aspect, introducing network controller, realized streaming media service from being linked into the unified Based Intelligent Control of transmission, the adverse effect that has overcome the not enough of existing CDN technology and bearer network is brought, filled up the industry blank, meet future network and service technique development trend.Another embodiment of the present invention specifically defines how in the SDN network, to realize trans-regional streaming media distribution; Other embodiments of the invention define respectively in the framework and flow process new at this, how to realize the functions such as authentication, charging.The operation of the embodiment of the present invention is not limited to Virtual network operator, cutting apart of the virtual and network of Virtual network operator by network, can rent other service provider by the mode of hiring out, manage among a small circle and have the customer group of particular demands by other service provider.The embodiment of the present invention is not limited to the application of MAN of large size city, and because SDN is an opening, extendible framework, this mechanism and method also can expand between metropolitan area network and metropolitan area network and expand to the whole nation.
The accompanying drawing explanation
Fig. 1 is the operation principle schematic diagram of software defined network;
Fig. 2 is the schematic flow sheet of the streaming media distribution method of embodiment mono-;
Fig. 3 is the schematic flow sheet of the first situation in the example of embodiment mono-;
Fig. 4 is the schematic flow sheet of the second situation in the example of embodiment mono-;
Fig. 5 is the schematic block diagram of flow media distribution system in embodiment bis-.
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in detail.
It should be noted that, if do not conflict, each feature in the embodiment of the present invention and embodiment can mutually combine, all within protection scope of the present invention.In addition, although there is shown logical order in flow process, in some cases, can carry out step shown or that describe with the order be different from herein.
Embodiment mono-, a kind of streaming media distribution method based on software defined network as shown in Figure 2, comprise step 201～205:
201, the first application server of Access Network extracts required parameter from the received request to stream medium data, extracted required parameter is sent to the first network controller of Access Network;
202, described first network controller is transmitted to the first service scheduling engine connected by the Openflow agreement by the described request parameter, and indication Access Network and related network elements are the reserved link of described request and bandwidth resources;
Whether the stream medium data that 203, described first service scheduling engine inquiry is asked is in this locality; When in this locality, carry out step 204;
204, described first service scheduling engine is selected a streaming media server from local (zone that the first service scheduling engine is managed); 205, selecteed streaming media server passes through reserved link and bandwidth resources provide asked stream medium data.
Described related network elements can be, but not limited to comprise: local switch, OLT, GGSN, SGSN etc.
In an embodiment of the present embodiment, in described step 203, can also comprise:
During not in this locality, carry out step 206 when asked stream medium data;
Described method can also comprise:
206, described first service scheduling engine is notified described first network controller;
207, described first network controller is transmitted to the described request parameter the second application server of transmission network by described the first application server;
208, described the second application server is determined Service Quality Metrics according to the described request parameter, and sends to the second network controller of transmission network;
209, described second network controller is determined optimal transmission paths according to described Service Quality Metrics, and sends to the switching equipment of transmission network; From described first network controller receives the source address of described request, send to the second service scheduling engine connected by the Openflow agreement;
210, described second service scheduling engine from managed zone (not being the zone sent under the user of described request) select a streaming media server;
211, selected streaming media server is by described switching equipment, according to described optimal transmission paths, to the source address of described request, provides asked stream medium data.
Present embodiment, by access aspect and transmission aspect, introducing network controller (being network operating system), realizes streaming media service from being linked into the unified Based Intelligent Control of transmission.
Can also on the basis of present embodiment, complete the mechanism such as authentication, Path Setup, content requests service, load balancing of streaming media service.
In present embodiment, can communicate by Openflow interface and agreement between described first, second network controller and switching equipment (as convergence switch, metro switch, router, gateway general packet wireless service support node GGSN etc.), terminal equipment (as Optical Network Terminal OLT) and service dispatch engine, between first/second network controller and the first/the second application server, can adopt api interface to carry out alternately.
In present embodiment, described first, second service dispatch engine and streaming media server can be realized by the cloud memory technology; Thereby meet streaming media service quality.Because the streaming medium content of magnanimity needs a kind of storage, index and occupation mode of effective, so the cloud storage is at present by universally recognized large data storage method.The cloud storage is in cloud computing (cloud computing) conceptive extension and a development new concept out, refer to by functions such as cluster application, grid or distributed file systems, a large amount of various dissimilar memory devices in network are gathered to collaborative work by application software, a system of data storage and Operational Visit function externally is provided jointly.Therefore the cloud storage is one and take the cloud computing system that the data store and management is core.The media content of different media formats, encoding and decoding, file type is supported in the cloud storage, concentrates optimum management; High speed Cache algorithm, the multi-format buffer memory, support distributed layer to dispose, and reduces storage and Cache space.Media content can store and read by burst; There is error correction and fault-tolerant ability; The life cycle of managing media content; According to the logical identifier of media, navigate to the media store position in node; Store control for file content and streamable content; Obtain storaging state information; Unified content is injected and management.Distributed storage technology based on cloud, realize that large capacity, highly reliable, low-cost storage share, and media content is supported in automated back-up between the storage of strange land.
Present embodiment is based on the software defined network technology, for the shortcoming of existing content distributing network and the adverse effect that bearer network is brought thereof, a kind of new streaming media distribution method based on software defined network has been proposed, the advantage that possesses CDN, overcome the deficiency of CDN simultaneously, can realize finely regulating and the scheduling to Streaming Media resource requirement and bandwidth by the network controller of Access Network and the network controller of transmission network; The network controller of Access Network and the network controller of transmission network can, according to the demand according to resource reservation and assurance bandwidth aspect, complete part or all of operation in existing regulation and control flow processs " physical topology → virtual topology → routing algorithm (collocation strategy) → control set of paths → node-routing decision-making → hardware specific is transmitted ".
In an embodiment of the present embodiment, described first service scheduling engine can also comprise from the step of a streaming media server of this locality selection:
Described first service scheduling engine notifies stream medium data that described first network controller asks in this locality;
Described first network controller starts asked streaming media service charging by described the first application server notice OSS, and notifies described first service scheduling engine that service is provided;
When asked stream medium data during not in this locality, described first service scheduling engine can also comprise after notifying the step of described first network controller:
Described first network controller starts, to asked streaming media service charging, the source address of described request to be sent to described second network controller by described the first application server notice OSS.
In a kind of alternative of present embodiment, described method can also comprise:
After described first network controller is received the request of the end service that streaming media server directly sends or sends by the second network controller, by described the first application server notice OSS, stop charging.
In an embodiment of the present embodiment, whether the stream medium data that described first service scheduling engine inquiry is asked can also comprise before local step:
The streaming media server of the first burst that described first service scheduling engine selection comprises asked stream medium data;
Selected streaming media server passes through the first burst that reserved link and bandwidth resources provide asked stream medium data; If do not receive the request that stops service after the first burst finishes, this streaming media server notifies described first network controller to continue to play by described first service scheduling engine.
In this alternative, carry out stream medium data that the inquiry of described first service scheduling engine asks whether when local step, what inquire about is other burst after stream medium data the first burst.
The flow media distribution system of present embodiment adopts distributed treatment and parallel computation, and therefore the request of stream service can be concentrated by the Distributed Services scheduling engine and be controlled.Consider user's statistics use habit and the interactive requirements of program request, present embodiment is carried out burst (such as content being divided into to every 5 minutes a slices) storage to streaming medium content, the first of at least 60% film (starting the content of 5 minutes) can be placed on to the most close user's network " edge " (takes this strategy to be based on existing IPTV user when request program, most of users are by trying and determine whether complete the reading through by whole film this sheet content of first 5 minutes), other content adopts the distributed storage mode, and (other burst that is program may be placed on this locality, also may be placed on other city), as adopt the cloud memory technology, can also automatically regulate according to user's program request rule storage mode and the place of Streaming Media, and user's request is carried out to load balance scheduling (its technological borrowing load balancing and the content management technique of CDN), to guarantee streaming media server, can respond fast user's request.
In an embodiment of the present embodiment, described the first application server can also comprise before the received step to extraction required parameter the request of stream medium data:
The first network controller of Access Network receives the request to stream medium data, is transmitted to described the first application server;
The first application server, according to the user ID inquiry OSS in this request, is confirmed that whether this user is legal and authority is arranged;
If the user is illegal or lack of competence, notifies described first network controller, and this user's user ID is sent to described first network controller; Described first network controller stops providing service to the corresponding user of described user ID;
If the user is legal and authority is arranged, carry out described the first application server from the received step to extraction required parameter the request of stream medium data.
Below with the example of the streaming media distribution service of a large-scale metropolitan area network, further illustrate the present embodiment.
In this example, described first network controller is access network controller, and the second network controller is the transmission network controller; The first application server comprises epg server, authentication server and Streaming Media Control Server; The second application server comprises flow controller.
This example is divided into two kinds of situations, a kind of situation is that the streaming medium content that local user accesses is stored in this locality, therefore not needing MAN transmission network when setting up flow media session and transmission channel is its reserved link and resource, and streaming media service completes in a city; If the media content of user's access is not in this locality, and in another city, therefore need to carry out accessed, need access network controller and transmission network controller jointly to cooperate for this reason, be flow media session and the reserved access network of transmission channel and transmission link and bandwidth resources.
Another kind of situation is that the strange land user accesses local streaming medium content, its process is identical with the first situation with principle, therefore this example only provides the program request flow process to two kinds of modes in the first situation, process and the on-demand process of live TV stream are similar, only need to change streaming media server into live source and get final product, can consider without charging flow simultaneously.
In this example, the first burst of at least 60% content is placed on to this locality (to improve response speed), therefore for other program of 40%, belong to the situation that the strange land user accesses local content, with trans-regional program request flow process in the first situation be similarly, no longer provide example flow here.
Situation one: local streaming media on demand flow process, as shown in Figure 3, process prescription following (illustrate: in Fig. 3 three " the Streaming Media Control Server " and square frame is real is same entity), comprise step (0)～(22A).
(0) the IP address of client by default epg server or initiatively input its IP address and log in, epg server sends to the homepage of program guide the client of terminal.
(1) user has selected the some flow-medium performances on the menu (by remote controller or mouse), client sends to access network controller by this request of user, and this request comprises required parameter (access style, the media ID of request, the form of media, terminal type that the area of user ID, user's request, user's IP address, user use).
(2) access network controller sends to epg server by this request.
(3) epg server is transmitted to the authentication server by this request, and this server extracts user ID wherein.
(4) the authentication server is by the OSS on inquiry backstage, confirms that whether legal and this user of user uses the authority of this business, and confirmation is returned to the authentication server.
(5) if the user is illegal, or the user do not use the authority of this business, and the authentication server returns to epg server by these information.
(6) epg server returns to this user's information to access network controller.
(7) access network controller returns to the illegal message of user, and stops providing service to the user.
(8) if the user can use this business, the authentication server sends to the Streaming Media Control Server by user's request, this server extracts required parameter wherein, comprises user's IP address, the access style that the user uses, the media ID of request, the form of media.
(9) the Streaming Media Control Server sends to access network controller by the parameter of extraction.
(10) access network controller retransmitting paramater bag, to the first service scheduling engine of Streaming Media, requires access network and related network elements thereof for the reserved link of user and bandwidth resources simultaneously.
(11) the first service scheduling engine, after computing, determines that best streaming media server is prepared as the user service is provided.
(12) streaming media server provides streaming media service according to user's IP address for the user.Streaming media server is no more than 5 minutes for the view for free time that the user provides, if surpass 5 minutes users, does not also want to stop, and enters next action.
(13) message that streaming media server continues the user to watch sends to access network controller by the first service scheduling engine.Whether other burst that the first service scheduling engine is inquired about this stream is stored in this locality, if be stored in this locality, be exactly the execution step (14A)～(22A), if be stored in other city, according to hereinafter across city streaming media on demand flow processing.
(14A) access network controller is transmitted to the Streaming Media Control Server by this message bag.
(15A) Streaming Media Control Server notice OSS starts as the user uses this service billing, and charging can on time, also can be finished watching a film and receive once expense.
(16A) access network controller notice first service scheduling engine continues as this user provides service.
(17A) streaming media server of first service scheduling engine arrangement the best is prepared as the user and continues to provide service.
(18A) streaming media server continues as the user streaming media service is provided.The user can finish watching this film, also can require to stop service midway.
If (19A) user submits to stop service to, just to streaming media server, send ending request message.
(20A) streaming media server sends the end bag by the first service scheduling engine to access network controller.
(21A) access network controller is to Streaming Media Control Server forwarding messages bag.
(22A) the Streaming Media Control Server sends and stops charging message to OSS.
Situation two: across city streaming media on demand flow process, as shown in Figure 4, preceding step (0)～(13), with consistent above, repeat no more here, the following describes be step (13) afterwards across the city handling process, comprise step (14B)～(28B).
(14B) access network controller is transmitted to the Streaming Media Control Server by this message bag.
(15B) the streaming media service Control Server in the Access Network application will comprise user's IP address, access style, the media ID of request, the form of media, the terminal type parameter information that the user uses sends to the traffic engineering server in the transmission network application.
(16B) the traffic engineering server is in conjunction with these parameters, design the Service Quality Metrics such as network that this Streaming Media needs and bandwidth, such as the bandwidth of SD stream is 2Mbps, the bandwidth of high clear stream is 8Mbps, the specification requirement such as time delay, shake, and these requirements are sent to the transmission network controller.
(17B) the transmission network controller is realized the dynamic dispatching to flow according to the requirement of traffic engineering, preferential guarantee commitment flow, according to stream QoS demand properties, determine optimal transmission paths, it is to control switch/router by Openflow interface and agreement to realize.
(18B) access network controller notification streams media control server after completing (14B) starts charging to this user.
(19B) Streaming Media Control Server notice OSS starts as the user uses this service billing, and charging can on time, also can be finished watching a film and receive once expense.
(20B) access network controller, by user's IP address notification transmission network controller, requires to continue as the user stream service is provided.
(21B) transmission network controller notice second service scheduling engine continues as this user provides service.
(22B) in the zone that the arrangement of second service scheduling engine is managed, best streaming media server is prepared as the user and continues to provide service.
(23B) the IP address of streaming media server User continues as the user provides streaming media service.The user can finish watching this film, also can require to stop service midway.
If (24B) user submits to stop service to, just to streaming media server, send ending request message.
(25B) streaming media server sends the end bag by the second service scheduling engine to the transmission network controller.
(26B) the transmission network controller forwards the end bag to access network controller.
(27B) access network controller is to Streaming Media Control Server forwarding messages bag.
(28B) the Streaming Media Control Server sends and stops charging message to OSS.
Embodiment bis-, and a kind of flow media distribution system based on software defined network comprises:
The first network controller of Access Network, first service scheduling engine, streaming media server;
The first application server of Access Network, be connected with the first network controller by api interface, for the request to stream medium data received, extracts required parameter, and extracted required parameter is sent to described first network controller;
Described first network controller is for being transmitted to the first service scheduling engine connected by the Openflow agreement by the described request parameter, and indication Access Network and related network elements are the reserved link of described request and bandwidth resources;
Whether the stream medium data that described first service scheduling engine is asked for inquiry is in this locality; Select a streaming media server from this locality when in this locality;
Described streaming media server is for after being chosen by described first service scheduling engine, and passing through reserved link and bandwidth resources provides asked stream medium data.
Described the first application server comprises the Streaming Media Control Server, Streaming Media type based on terminal type, place to use, terminal are asked is reserved to access network controller proposition link and bandwidth resources, the bandwidth flowed such as SD is 2Mbps, the bandwidth of high clear stream is 8Mbps, completes applied logic and controls.
The core of the first network controller of Access Network is network operating system, by OpenFlow interface and agreement, can realize multiple isomerization access network is unified to control and management, centralized dynamic mechanism of control is more flexible than traditional artificial network management system, realize wired, wireless comprehensive access, meet the needs of the network integration.The related network elements of described first network controller by Access Network is (as OLT, GGSN, SGSN, convergence switch etc.) terminal of using with the user is connected, and pass through Openflow interface and protocol communication between the related network elements of Access Network and first service scheduling engine, with between the first application server, by api interface, communicate by letter, can complete the control and management of each user access network, for path and the bandwidth of access aspect are determined in each streaming media service, can also propose the request of link and RSVP resource and determine path for this reason MAN transmission network according to user's request.Streaming media server can connect terminal by the related network elements of Access Network.
In an embodiment of the present embodiment, described system as shown in Figure 5, can also comprise:
The second application server of transmission network, second network controller, switching equipment;
The second service scheduling engine;
Described first service scheduling engine can also, for working as asked stream medium data not when this locality, be notified described first network controller;
Described first network controller can also be for when receiving that asked stream medium data, not after local notice, is transmitted to described the second application server by the described request parameter by described the first application server;
Described the second application server is connected with the second network controller by api interface, for according to the described request parameter, determining Service Quality Metrics, and sends to described second network controller;
Described second network controller is used for determining optimal transmission paths according to described Service Quality Metrics, and sends to described switching equipment; From described first network controller receives the source address of described request, send to the second service scheduling engine connected by the Openflow agreement;
Described second service scheduling engine is selected a streaming media server for the zone from managed;
Described streaming media server is for pass through described switching equipment when being chosen by described second service scheduling engine after, according to described optimal transmission paths, to the source address of described request, provides asked stream medium data.
In present embodiment, transmission network is the MAN transmission network based on SDN, described the second application server can be, but not limited to as the traffic engineering server, function comprises network management, policy control, traffic engineering (the needed bandwidth of this Media Stream, the bandwidth flowed such as SD is 2Mbps, the bandwidth of high clear stream is 8Mbps etc.) and other third party's application etc., these application make operator effectively to manage link and bandwidth resources from the angle of whole transmission network, and the resource of giving priority in arranging for meets the requirement of service priority.
The switching equipment of transmission network can comprise: switch, router, metro switch etc., and wherein switch and metro switch can be, but not limited to the level into Tbit; Router can directly or by the related network elements (as OLT, GGSN, convergence switch etc.) in level metro switch and Access Network be connected.Streaming media server can be connected with router by switch.
The second network controller of transmission network is connected with the second service scheduling engine, by Openflow interface and protocol communication (being represented by dotted lines Openflow interface and agreement in Fig. 5), with between the second application server, by api interface, communicate by letter, roughly workflow comprises that physical topology → virtual topology → routing algorithm (collocation strategy) → control set of paths → node-routing decision-making → hardware specific is transmitted, can realize dynamic monitoring in real time and the optimized network configuration to transmission network by OpenFlow interface and agreement, requirement according to traffic engineering realizes the dynamic dispatching to flow.Its work principle be first guarantee commitment flow preferential, determine the optimal path transmission according to stream QoS demand properties, form the intelligent pipeline of video traffic.
Described first, second service dispatch engine and each streaming media server can be, but not limited to adopt the cloud memory technology to realize.
In a kind of alternative of present embodiment, described first service scheduling engine can also be for selecting a streaming media server from this locality, notifies stream medium data that described first network controller asks in this locality;
Described first network controller can also be for receiving that asked stream medium data is after local notice, start asked streaming media service charging by described the first application server notice OSS, and notify described first service scheduling engine that service is provided; And, when receiving that asked stream medium data is not after local notice, by described the first application server notice OSS, start, to asked streaming media service charging, the source address of described request to be sent to described second network controller.
In this alternative, described first network controller can also, for after the request when receiving the end service that streaming media server directly sends or sends by the second network controller, stop charging by described the first application server notice OSS.
In an embodiment of the present embodiment, described first service scheduling engine can also at the inquiry stream medium data of asking whether before this locality, select the streaming media server of first burst that comprises asked stream medium data from this locality;
Described streaming media server also provides the first burst of asked stream medium data for passing through reserved link and bandwidth resources after selected; If do not receive the request that stops service after the first burst finishes, by described first service scheduling engine, notify described first network controller to continue to play.
In an embodiment of the present embodiment, described first network controller can also, for receiving the request to stream medium data, be transmitted to described the first application server; And when receiving the user illegally or, after the notice and user ID of lack of competence, stopping providing service to the corresponding user of described user ID;
Described the first application server also extracts required parameter for the request to stream medium data from received, according to the user ID inquiry OSS in this request, confirm that whether this user is legal and authority is arranged; If the user is illegal or lack of competence, notifies described first network controller, and user ID is sent to the first network controller; If the user is legal and authority is arranged, carry out from the received operation to extraction required parameter the request of stream medium data.
Described the first application server can also comprise the access authentication authentication server, for by being connected with the OSS of operator, to realize the operation demands such as authentication to the user; Can also comprise epg server EPG and other application; Described first network controller is transmitted to EPG by the user to the request of stream medium data, and EPG sends to the authentication server by user ID.Whether described authentication server is legal and lack of competence arranged by user ID inquiring user in OSS, when confirming that the user is legal and having the right in limited time, by described Streaming Media Control Server notice first network controller; When confirming the illegal or lack of competence of user, by EPG, notify the first network controller.
One of ordinary skill in the art will appreciate that all or part of step in said method can come the instruction related hardware to complete by program, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Certainly; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of claim of the present invention.
Claims (10)
1. the streaming media distribution method based on software defined network comprises:
The first application server of Access Network extracts required parameter from the received request to stream medium data, extracted required parameter is sent to the first network controller of Access Network;
Described first network controller is transmitted to the first service scheduling engine connected by the Openflow agreement by the described request parameter, and indication Access Network and related network elements are the reserved link of described request and bandwidth resources;
Whether the stream medium data that described first service scheduling engine inquiry is asked is in this locality; When in this locality, described first service scheduling engine is selected a streaming media server from this locality;
Selecteed streaming media server passes through reserved link and bandwidth resources provide asked stream medium data.
2. the method for claim 1, is characterized in that, also comprises:
When asked stream medium data, during not in this locality, described first service scheduling engine is notified described first network controller;
Described first network controller is transmitted to the described request parameter the second application server of transmission network by described the first application server;
Described the second application server is determined Service Quality Metrics according to the described request parameter, and sends to the second network controller of transmission network;
Described second network controller is determined optimal transmission paths according to described Service Quality Metrics, and sends to the switching equipment of transmission network; From described first network controller receives the source address of described request, send to the second service scheduling engine connected by the Openflow agreement;
Described second service scheduling engine is selected a streaming media server from managed zone;
Selected streaming media server is by described switching equipment, according to described optimal transmission paths, to the source address of described request, provides asked stream medium data.
3. method as claimed in claim 2, is characterized in that, described first service scheduling engine also comprises from the step of a streaming media server of this locality selection:
Described first service scheduling engine notifies stream medium data that described first network controller asks in this locality;
Described first network controller starts asked streaming media service charging by described the first application server notice OSS, and notifies described first service scheduling engine that service is provided;
When asked stream medium data during not in this locality, described first service scheduling engine can also comprise after notifying the step of described first network controller:
Described first network controller starts, to asked streaming media service charging, the source address of described request to be sent to described second network controller by described the first application server notice OSS;
After described first network controller is received the request of the end service that streaming media server directly sends or sends by the second network controller, by described the first application server notice OSS, stop charging.
4. method as described as any one in claim 1 to 3, is characterized in that, whether the stream medium data that described first service scheduling engine inquiry is asked also comprises before local step:
Described first service scheduling engine is selected the streaming media server of first burst that comprises asked stream medium data from this locality;
Selected streaming media server passes through the first burst that reserved link and bandwidth resources provide asked stream medium data; If do not receive the request that stops service after the first burst finishes, this streaming media server notifies described first network controller to continue to play by described first service scheduling engine.
5. method as described as any one in claim 1 to 3, is characterized in that, described the first application server also comprises before the received step to extraction required parameter the request of stream medium data:
Described first network controller receives the request to stream medium data, is transmitted to described the first application server;
The first application server, according to the user ID inquiry OSS in this request, is confirmed that whether this user is legal and authority is arranged;
If the user is illegal or lack of competence, notifies described first network controller, and this user's user ID is sent to described first network controller; Described first network controller stops providing service to the corresponding user of described user ID;
If the user is legal and authority is arranged, carry out described the first application server from the received step to extraction required parameter the request of stream medium data.
6. the flow media distribution system based on software defined network, is characterized in that, comprising:
The first network controller of Access Network, first service scheduling engine, streaming media server;
The first application server of Access Network, be connected with the first network controller by api interface, for the request to stream medium data received, extracts required parameter, and extracted required parameter is sent to described first network controller;
Described first network controller is for being transmitted to the first service scheduling engine connected by the Openflow agreement by the described request parameter, and indication Access Network and related network elements are the reserved link of described request and bandwidth resources;
Whether the stream medium data that described first service scheduling engine is asked for inquiry is in this locality; Select a streaming media server from this locality when in this locality;
Described streaming media server is for after being chosen by described first service scheduling engine, and passing through reserved link and bandwidth resources provides asked stream medium data.
7. system as claimed in claim 6, is characterized in that, also comprises:
The second application server of transmission network, second network controller, router, switching equipment;
The second service scheduling engine;
Described first service scheduling engine also, for working as asked stream medium data not when this locality, is notified described first network controller;
Described first network controller is also for when receiving that asked stream medium data, not after local notice, is transmitted to described the second application server by the described request parameter by described the first application server;
Described the second application server is connected with the second network controller by api interface, for according to the described request parameter, determining Service Quality Metrics, and sends to described second network controller;
Described second network controller is used for determining optimal transmission paths according to described Service Quality Metrics, and sends to described switching equipment; From described first network controller receives the source address of described request, send to the second service scheduling engine connected by the Openflow agreement;
Described second service scheduling engine is selected a streaming media server for the zone from managed;
Described streaming media server is for pass through described switching equipment when being chosen by described second service scheduling engine after, according to described optimal transmission paths, to the source address of described request, provides asked stream medium data.
8. system as claimed in claim 7 is characterized in that:
Described first service scheduling engine is also for selecting a streaming media server from this locality, notifies stream medium data that described first network controller asks in this locality;
Described first network controller is also for receiving that asked stream medium data is after local notice, start asked streaming media service charging by described the first application server notice OSS, and notify described first service scheduling engine that service is provided; When receiving that asked stream medium data is not after local notice, by described the first application server notice OSS, start, to asked streaming media service charging, the source address of described request to be sent to described second network controller; After the request of receiving the end service that streaming media server directly sends or sends by the second network controller, by described the first application server notice OSS, stop charging.
9. system as described as any one in claim 6 to 8 is characterized in that:
Described first service scheduling engine also at the inquiry stream medium data of asking whether before this locality, select the streaming media server of first burst that comprises asked stream medium data from this locality;
Described streaming media server also provides the first burst of asked stream medium data for passing through reserved link and bandwidth resources after selected; If do not receive the request that stops service after the first burst finishes, by described first service scheduling engine, notify described first network controller to continue to play.
10. system as described as any one in claim 6 to 8 is characterized in that:
Described first network controller also, for receiving the request to stream medium data, is transmitted to described the first application server; And when receiving the user illegally or, after the notice and user ID of lack of competence, stopping providing service to the corresponding user of described user ID;
Described the first application server also extracts required parameter for the request to stream medium data from received, according to the user ID inquiry OSS in this request, confirm that whether this user is legal and authority is arranged; If the user is illegal or lack of competence, notifies described first network controller, and this user's user ID is sent to the first network controller; If the user is legal and authority is arranged, carry out from the received operation to extraction required parameter the request of stream medium data.
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